A Dorchester man accused of kidnapping a 15-year-old girl at a T station and then forcing her into prostitution in a Quincy motel two years ago might change his plea to guilty later this month.

A plea change hearing is scheduled for 30-year-old Norman Barnes on Oct. 22 in Suffolk Superior Court in Boston, but neither prosecutors from the state Attorney General’s Office nor Barnes’ defense lawyer would comment about the case Thursday.

Barnes was caught by a State Police trooper as he attempted to flee on foot from the Best Western Adams Inn in North Quincy, where he held the girl captive, authorities say.

Set for a jury trial Oct. 28 in Boston, Barnes is accused of kidnapping the teenage girl at an MBTA stop on May 7, 2011, and coercing her to have sex with numerous men, including himself, in motel rooms and private homes in Quincy, Danvers and Dorchester, during the following 10 days.

Indicted by a special statewide grand jury in 2011, Barnes pleaded innocent to all the charges and has been held in jail on $3.5 million bail while awaiting trial.

Prosecutors said Barnes also forced another girl, then 16, into prostitution during the same time period.

“We believe the evidence will prove that this defendant exploited two underage girls by photographing them in states of undress, advertising them online, and forcing them into sex with strangers,” Suffolk County District Attorney Dan Conley said when the indictments against Barnes were announced.

Attorney General Martha Coakley pointed to the case as an example of human trafficking, but Barnes is not being prosecuted under the state’s new human trafficking laws because they went into effect five months after he was indicted.

In 2011 in Quincy District Court, Norfolk County prosecutor Erin Murphy said the 15-year-old girl “pleaded to go home, but (Barnes) told her, ‘You’re a woman. It’s time to make money.’”

Barnes was arrested in North Quincy after the 15-year-old escaped from the hotel room when Barnes had left her alone for a period of time and found a computer to send a Facebook message to tell family members to come to her rescue, Murphy said in Quincy District Court two years ago.

The girl’s aunt and uncle arrived at the hotel and saw their niece in the parking lot when Barnes also spotted her, police said.

“The defendant began to scream at the victim,” Murphy told Judge John A. Canavan in 2011.

The girl’s aunt then noticed a State Police trooper, Gale Bettinger, who was working a traffic detail near the Neponset River Bridge, and called to her for help, police said. Barnes saw the trooper and ran.

Bettinger ran after Barnes two blocks away on Newbury Street as he tried to climb a fence and arrested him, police said.

Page 2 of 2 - Police said they found more than $19,000 in Barnes’ front pockets and seized his 1987 Jaguar.

He allegedly had been charging men $100 to $150 an hour to have sex with each victim.

He is now charged with five counts of deriving support from a minor in prostitution; one count of statutory rape; and three counts of aiding and abetting statutory rape.

Charges of disseminating visual material of a nude child and posing or exhibiting a nude child were dismissed in 2012.